Dynamo-electric machine.



H. G. REIST.

DYNAMO ELECTRIC MACHINE.

APPLICATION IILBD HAY 13,1909.

Patented Aug. 23, 1910.

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HENRY G- EifiT AT TY.

H. G. REIST.

DYNAMO ELECTRIC MACHINE. APPLICATION nun KAY 13,1909.

. 968,420. Patented Aug. 23, 1910.

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UNITED STATES PATENT OFFICE.

HENRY G. REIST, OF SCHENEGTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTR-IG MACHINE.

To all whom it may concern:

Be it known that I, HENRY G. REIsT, a citizen of the United States,residing at Schenectady, in the county of Schenectady and State of NewYork, have invented certain new and useful Improvements inDynamo-Electric Machines, of which the following is a specification. r a

My invention relates to dynamo-electric machines, and more particularlyto the current-collecting and short-circuiting devices employed in suchmachines, especially of the induction motor type having coil-woundrotors.

The object of my invention is a simple arrangement and construction ofparts whereby the ciu'rent-collecting devices are easily moved into andout of the position in which they engage the collector rings oftheinduction motor and the short-circuiting device is moved out of and intothe position in which it short-circuits the collector rings.

The various features of novelty which characterize my invention arepointed out with particularity in the claims annexed to and forming apart of this specification.

For a better understanding of my inven tion, however, reference may behad to the following description taken in connection with theaccompanying drawings, in which- Figure 1 is an elevation with partsbroken away, of an induction motor having currentcollecting andshort-circuiting devices according to my invention; Fig. 2 is a sectionon the line AA of Fig. 1 looking in the direction of the arrows; Fig. 3is a section on the line 33 of Fig. 2; Fig. 4 is a section on the lineAA of Fig. 1 looking in the direction opposite to that of the arrows;and Fig. 5 is a section on the line 5-5 of Fig. 4.

Referring to the drawings, 1 is an induction motor having end shields 2in which the rotor shaft 3 is journaled. Upon the shaft 3 is fastened aset of collector rings 4, which in the present'case I have illustratedas being three in number. Brushes 5 mounted in brush-holders 6 bear uponthe collector rings 4. Flexible conductors 7 are bolted at one end tothe brush-holders and at the other end to terminals 8 whereby electricalconnections are made to devices external to the machine. The terminals 8and the conductors 7 may be fastened to Specification of Letters Patent.

Application filed May 13, 1909.

Patented Aug. 23, 1910. Serial No. 495,703.

members 9 which are in turn fastened to but insulated from the studs 10,as best shown in Fig. 4c.

The brush-holders 6 are pivotally mounted and are arranged to be rotatedso as to lift the brushes from engagement with the rings 4 by means ofan actuating member comprising the reciprocating shifting rods 11. Theserods 11 move in a direction at right angles to the studs or members 12on which the brush-holders 6 are mounted. The brush-holders areinsulated from the studs 12 by means of bushings 13. These studs 12extend parallel to the shaft 3 and are journaled in holes in thebrush-holder yoke 14 which is bolted to one of the end shields 2. To oneend of each stud is fastened a lever 15, which is engaged by the hook 16on the upper end of each rod 11, as will hereafter appear.

The rods 11 are loosely mounted in the lugs 17 cast integral with thebrush-holder yoke 1e. They are secured to the ends of the T-shapedshifting arm 18, preferably by being screwed therein and having theirends provided with lock-nuts 19. The link member 20 connects the lowerend of the shifting arm 18 with the lever member 21 fastened on therocker shaft 22. The rocker shaft is journaled in members 23 fastened tothe legs of the end shields 2. The rocker shaft is also provided with astop 21 for limiting its movement and with a handle for rotating it.

The collector rings 4 are short-circuited by means of a device whichmoves longitudinally of the shaft 3 and is connected to the rocker shaft22, and therefore, the handle 25 operates both the short-circuiting andthe brush-lifting device. The short-circuiting device consists of acollar 26 slidably mounted upon the shaft. This collar is provided withmembers 27 to which the brushes 28 are fastened. Vheu the collectorrings are open-circuited the brushes 28 engage the insulation 29. Inorder to short-circuit the rings the brushes 28 are moved so as toengage the inner surfaces 30 of the collector rings. The collar 26 isprovided with a groove 31 into which the pins 32 of the Y- shapedshifting lever or actuating member 33 extend. This shifting lever ispivotally mounted in the shaft 34 which is fastened in lugs 35 on thebrush-holder yoke 14; The end 36 of the shifting lever is connected tothe lever member 37 fastened to the'rocker shaft 22 by means of a link38.

Figs. 2 to 5 inclusive show the parts in the position in which the rings1 are opencircuited and the brushes 5 in contact therewith. In order toshort-circuit the collector rings and move the brushes 4 out ofengagement with them, the handle 25 is moved in the direction of thearrow in Fig. 1 and until the parts assume the position shown therein.Such a movement of the handle rotates the rocker shaft 22, which movesthe shifting lever 33 together with the collar 26, whereby the brushes28 are moved out of engagement with the insulation 29 and intoengagement with the surface 30 of the collector rings in order toshort-circuit them. The rotation of the rocker shaft also moves theshifting arm 18 downward and with it the shifting rods 11 until thehooks 16 engage the end of the levers 15 and rotate them together withthe studs 12 and brush-holders G'fastened thereto. The rotation of thebrush-holders moves the brushes out of engagement with the collectorrings. The rotation of the handle 25 in the opposite direction to thatof the arrow in Fig. 1 removes the short-circuit between the collectorrings, the brushes 28 once more engaging the in sulation 29, and returnsthe brushes 1 into engagement with the outer surface of the collectorrings, because the straight portions of the rods 11 engage the ends ofthe levers 15 and rotate them in the opposite direction to the rotationimparted by the hooks.

I desire it to be understood that my invention is not limited to theparticular construction shown and described, and I aim in the appendedclaims to cover all modifications which do not depart from the spirit ofmy invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. In combination with a dynamo electric machine, a set of rotatingcollector rings, brushes therefor, pivot-ally mounted brush holders forsaid brushes, means for rotating said brush holders comprisingreciprocating shifting rods having hooks at their upper ends, said hooksengaging said brush holders for rotating the brushes away from saidcollector rings, the straight portions of said rods engaging said brushholders for returning said brushes into engagement with said collectorrings, a handle, and means for con necting said handle to said rods.

2. In combination with a dynamo electric machine, a set of collectorrings, brushes therefor, studs, brush holders for said brushes fastenedto said studs, levers fastened to said studs, means for rotating saidbrush holders comprising reciprocating shifting rods having hooks attheir upper ends, said hooks engaging said levers for rotating thebrushes away from said collector rings, the straight portions of saidrods engaging said levers for returning said brushes into engagementwith said collector rings, a handle, and means for connecting saidhandle to said rods.

3. In combination with a dynamo electric machine, a brush holder yokehaving lugs thereon, a set of collector rings, brushes therefor, studssupported by said yoke, brush holders for said brushes fastened to saidstuds, levers fastened to said studs, means for rotating said brushholders comprising shifting rods moving in said lugs, said rods havinghooks at their upper ends, said hooks engaging said levers for rotatingthe brushes away from said collector rings, the straight portions ofsaid rods engaging said levers for returning the brushes into engagementwith said collector rings, a handle, and means for connecting saidhandle to said rods.

4:. In combinationwith a dynamo electric machine, a brush holder yokehaving lugs thereon, a set of collector rings, brushes therefor, studssupported by said yoke,

brush holders for said brushes fastened to said studs, levers fastenedto said studs, means for rotating said brush holders comprising shiftingrods moving in said lugs, said rods having hooks at their upper ends,said hooks engaging said levers for rotating the brushes away from saidcollector rings, the straight portions of said rods engaging said leversfor returning the brushes into engagement with said collector rings, ashifting arm to which said rods are fastened, a handle, and means forconnecting said handle to said shifting arm.

5. In combination with an induction motor, a brush-holder yoke havinglugs thereon, a set of collector rings, brushes therefor, studssupported by said yoke, brush-holders for said brushes fastened to saidstuds, levers fastened to said studs, means for rotating saidbrush-holders comprising shifting rods moving in said lugs, said rodshaving hooks at theirupper ends for engaging said levers, a shifting armto which said rods are fastened, a rocker shaft, a link connecting saidrocker shaft to said shifting arm, and a handle for rotating said rockershaft.

6. In combination with an induction motor, a brush holder yoke havinglugs thereon, a set of collector rings, brushes therefor, studsjournaled in said yoke, brush holders fastened to said studs, leversfastenedvto said studs, means for rotating said brush holders comprisingshifting rods moving in said lugs, said rods having hooks at their upperends, said hooks engaging said levers for rotating the brushes away fromsaid collector rings, the straight portions of said rods engaging saidlevers for returning said brushes into engagement with said collector'rings, a shifting arm to which said rods are fastened, a rocker shaft, alink connecting said rocker shaft to said shifting arm, and a handle forrotating said rocker shaft.

7. In combination With a dynamo-electric machine, a set of collectorrings, a shortcircuiting device therefor, means for moving saidshort-circuiting device comprising a handle, a rocker shaft and meansconnecting said rocker shaft to said short-circuiting device, brushesfor said collector rings, studs, brush-holders for said brushes fastenedto said studs, levers fastened to said studs, means for rotating saidbrush-holders comprising reciprocating shifting rods having hooks attheir upper ends, said hooks engaging said levers for rotating thebrushes away from said collector rings, the straight portions of saidrods engaging said levers for returning the brushes into en gagementwith said collector rings, and means for connecting said rods to saidrocker shaft.

8. In combination with a dynamo-electric machine, a set of collectorrings, a short-circuiting device therefor, means for moving saidshort-circuiting device comprising a handle, a rocker shaft and meansconnecting said rocker shaft to said short-circuiting device, abrush-holder yoke having lugs thereon, brushes for said collector rings,pivotally mounted brush-holders for said brushes, means for rotatingsaid brushholders comprising shifting rods moving in said lugs andoperatively associated with said brushholders, a shifting arm to whichsaid rods are fastened, and a link connecting said shifting arm to saidrocker shaft.

In Witness whereof, I have hereunto set my hand this 11th day of May,1909.

HENRY G. REIST.

Vitnesses BENJAMIN B. HULL, HELEN ORFORD.

